.poster-book-board {
    width: 1100px;
    margin: 40px auto 40px;
    padding: 10px;
    

    .poster-book-item {
        float: left;
        width: 300px;
        height: 160px;
        margin: 0 30px;
        border-radius: 10px;
        overflow: hidden;
        box-shadow: 5px 5px 5px #999;
        

        .poster-book-img {
            height: 100%;
            transition: all .4s linear;
            cursor: pointer;
        }

        &:hover .poster-book-img {
            transform: scale(1.1);
        }
    }
}